Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdcc317e632a2b3…

MALICIOUS

PDF

85.0 KB Created: 2021-09-13 10:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 28f47b2ed6b8b7f9a164414c3d015432 SHA-1: c21e70a732c29cc17fc8ba25e23c3b88f40abbb4 SHA-256: fcdcc317e632a2b3a9b97c591f6738aed66b8446338ebda2fc1d881f394293ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=castle+clash+mod+apk+unlimited+gems PDF link annotation
    • http://tano-cable.com/d/files/67869186973.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/61257595675.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/96095122887.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/lefubowaguxogeta.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/67192915192.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c21e79214e2603722221e16fb82c1f2e/15590758737.pdfIn PDF document text
    • http://medi-sen.com/files/files/46857635787.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/344856665.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/tuzubesoguradok.pdfIn PDF document text
    • http://infunplastic.com/d/files/21463257874.pdfIn PDF document text
    • http://tai-group.com/upload/files/musobivoxesaru.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/46243161085.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/bc2e5ab81812e38ba451557037e9d526/woxuzedilil.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613825ea95b03---lajuratoferib.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/noluwojitupoxamivilib.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/rugebakuxupiretonuturi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613278c908e42---85388494622.pdfIn PDF document text
    • http://sro52.ru/uploads/files/nedezetanezinivenamuset.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/lufopejunaba.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/24454066890.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/1222084172.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/13713111725.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/busorakivurinexobin.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/duzotozifojixugokurene.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c07881703eefbd14c6398edb332e9f63/83311080387.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 17812 bytes
SHA-256: d005ef44a843912a99731cc74e0da2af910c905c6a4e4666218ac3fa4f73ddd2
font_01_sfnt_off000114a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A0 11084 bytes
SHA-256: fc633f68178755dc705dac40f0971c3db4c25e3e0c41a316c3cc6a41f27e7ee5
font_02_sfnt_off00012e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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